IFCPAR AR (ENGLISH) for CD - CEFIPRA

46
Pure and Applied Physics
Dr. S. Anantha Ramakrishna
Department of Physics
Indian Institute of Technology
Kanpur
Dr. Sébastien Guenneau
Institut Fresnel, UMR CNRS 6133
Universié Aix-Marseille III
Marseille
Focusing through a plasmonic lens for a surface
Plasmon polariton (SPP) line source at wavelength
λ = 700 nm. (a) Schematic diagram of the flat SPP
lens with a hexagonal lattice of dielectric cylinders
(permittivity ε1*
= 13, diameter d = 107 nm, and
height h =700 nm) with center-to-center spacing
of a = 180 nm, on a metal plate. (b) 2D plot of the
phase of the magnetic field. (c) 3D plot of the
phase of the magnetic field. (d) 2D plot of the
magnitude of the magnetic field.
Project 3804-2
PLASMONIC PROPERTIES OF CHECKERBOARD METALLIC
STRUCTURES AND FILMS
IFCPAR
Indo-French Centre for the Promotion of Advanced Research
Duration: Three years (August, 2008 to July, 2011)
Objectives
i) Investigate the electromagnetic and plasmonic properties
of metallic films patterned on a sub-wavelength
lengthscales and particularly those of checkerboard
structures
ii) Investigate both analytically and numerically the
properties of surface plasmon excitations on metallic films
structured at sub-wavelength and near- wavelength
scales. Particularly the effect on the properties due to
dissipation in the metal and the finite size of the structures
to be investigated
iii) Using Focussed Ion Beam (FIB) techniques, experimentally
create sub- wavelength sized patterns, which are identified
through the theoretical studies, on metallic films of gold
and silver (which are best suited for surface plasmon
propagation on account of low dissipation)
iv) Experimentally study the spectral properties and field
distributions of radiation transmitted /reflected /scattered
by the patterned metal films. The effects of imbedding
non-linear materials in these structures and local field
enhancements to be studied. Applications such as Surface
Enhanced Raman Spectroscopy (SERS) to be attempted
Accomplishments
i) Negative refraction and perfect lenses for surface plasmons
on structured plasmonic surfaces
ii) Broadband extra-ordinary transmission of light through
checkerboard structured films
iii) Enhanced plasmonic properties, large fluorescence
enhancements and Surface enhanced Raman scattering
from molecules deposited on checkerboard structured
plasmonic films
iv) Calculation of local field enhancements and local density of
modes for checkerboard structures
v) Broad band properties of plasmonic meta-surfaces
Research papers published: Two
Papers presented in conferences: 1
Poster: 1